package com.rear.utils;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.UUID;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
public class ImgBase64 {  
  
    // 图片转化成base64字符串  
    public static String GetImageStr(String imgFile) {// 将图片文件转化为字节数组字符串，并对其进行Base64编码处理  
        InputStream in = null;  
        byte[] data = null;  
        // 读取图片字节数组  
        try {  
            if(imgFile==null||"".equals(imgFile)){  
                imgFile="uploaddir/file/default.png";  
            }  
            in = new FileInputStream(imgFile);  
            data = new byte[in.available()];  
            in.read(data);  
            in.close();  
        } catch (IOException e) {  
            e.printStackTrace();  
        }  
        // 对字节数组Base64编码  
        BASE64Encoder encoder = new BASE64Encoder();  
        return encoder.encode(data);// 返回Base64编码过的字节数组字符串  
    }  
  
    // base64字符串转化成图片  
    public static String GenerateImage(String imgStr) { // 对字节数组字符串进行Base64解码并生成图片
    	imgStr=imgStr.substring(imgStr.indexOf(",")+1);//需要去掉头部信息，这很重要
    	SimpleDateFormat formater = new SimpleDateFormat("yyyy/MM/dd");
		String path = "upload/" + formater.format(new Date()) + "/"
				+ UUID.randomUUID().toString().replaceAll("-", "") + ".jpg";
		String imgFilePath = PropertyUtils.getValue("image.file.path") + "/" + path;
		File file = new File(PropertyUtils.getValue("image.file.path") + "/" + path);
		if (!file.getParentFile().exists()) {
			file.getParentFile().mkdirs();
		}
        BASE64Decoder decoder = new BASE64Decoder(); 
        try {  
            // Base64解码  
            byte[] b = decoder.decodeBuffer(imgStr);  
            for (int i = 0; i < b.length; ++i) {  
                if (b[i] < 0) {// 调整异常数据  
                    b[i] += 256;  
                }  
            }  
            // 生成jpeg图片 
            OutputStream out = new FileOutputStream(imgFilePath);  
            out.write(b);  
            out.flush();  
            out.close();  
        } catch (Exception e) {  
        	e.printStackTrace();
        }  
        return path;  
    }  
  
}  


